<template>
    <div>
        <h1>当前求和为：{{ sum }}</h1>
        <h1>当前求和值放大10倍为：{{ bigSum }}</h1>
        <h1>我在{{ school }}学习{{ subject }}</h1>
        <select v-model.number="n">
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
        </select>
        <button @click="increment">+</button>
        <button @click="decrement">-</button>
        <button @click="incrementOdd">当前求和为奇数再加</button>
        <button @click="incrementWait">等一等再加</button>
    </div>
</template>

<script>
import { mapState, mapGetters } from "vuex";

export default {
    name: "Count",
    data() {
        return {
            n: 1, //用户选择的数字
        };
    },
    methods: {
        increment() {
            this.$store.commit("JIA", this.n);
        },
        decrement() {
            this.$store.commit("JIAN", this.n);
        },
        incrementOdd() {
            this.$store.dispatch("jiaOdd", this.n);
        },
        incrementWait() {
            this.$store.dispatch("jiaWait", this.n);
        },
    },
    computed: {
        /* sum() {
            return this.$store.state.sum;
        },
        school() {
            return this.$store.state.school;
        },
        subject() {
            return this.$store.state.subject;
        }, */
        /* bigSum() {
            return this.$store.getters.bigSum;
        }, */
        //借助mapState生成计算属性，从state中读取数据。（对象写法）
        /* ...mapState({
            sum: "sum",
            school: "school",
            subject: "subject",
        }), */
        //数组写法
        ...mapState(["sum", "school", "subject"]),
        ...mapGetters(["bigSum"]),
    },
    mounted() {
        console.log(this.$store);
    },
};
</script>

<style scoped>
button {
    margin-left: 5px;
}
</style>